<?php

/**
* Access the HTTP Request
*/
class http_request {

    /** additional HTTP headers not prefixed with HTTP_ in $_SERVER superglobal */
    var $add_headers = array('CONTENT_TYPE', 'CONTENT_LENGTH');

    /**
    * Construtor
    * Retrieve HTTP Body
    * @param Array Additional Headers to retrieve
    */
    function http_request($add_headers = false) {
    
        $this->retrieve_headers($add_headers);
        $this->body = @file_get_contents('php://input');
    }
    
    /**
    * Retrieve the HTTP request headers from the $_SERVER superglobal
    * @param Array Additional Headers to retrieve
    */
    function retrieve_headers($add_headers = false) {
        
        if ($add_headers) {
            $this->add_headers = array_merge($this->add_headers, $add_headers);
        }
    
        if (isset($_SERVER['HTTP_METHOD'])) {
            $this->method = $_SERVER['HTTP_METHOD'];
            unset($_SERVER['HTTP_METHOD']);
        } else {
            $this->method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : false;
        }
        $this->protocol = isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : false;
        $this->request_method = isset($_SERVER['REQUEST_METHOD']) ? $_SERVER['REQUEST_METHOD'] : false;
        
        $this->headers = array();
        foreach($_SERVER as $i=>$val) {
            if (strpos($i, 'HTTP_') === 0 || in_array($i, $this->add_headers)) {
                $name = str_replace(array('HTTP_', '_'), array('', '-'), $i);
                $this->headers[$name] = $val;
            }
        }
    }
    
    /** 
    * Retrieve HTTP Method
    */
    function method() {
        return $this->method;
    }
    
    /** 
    * Retrieve HTTP Body
    */
    function body() {
        return $this->body;
    }
    
    /** 
    * Retrieve an HTTP Header
    * @param string Case-Insensitive HTTP Header Name (eg: "User-Agent")
    */
    function header($name) {
        $name = strtoupper($name);
        return isset($this->headers[$name]) ? $this->headers[$name] : false;
    }
    
    /**
    * Retrieve all HTTP Headers 
    * @return array HTTP Headers
    */
    function headers() {
        return $this->headers;
    }
    
    /**
    * Return Raw HTTP Request (note: This is incomplete)
    * @param bool ReBuild the Raw HTTP Request
    */
    function raw($refresh = false) {
    
        if (isset($this->raw) && !$refresh) {
            return $this->raw; // return cached
        }
    
        $headers = $this->headers();
        $this->raw = "{$this->method}\r\n";
        
        foreach($headers as $i=>$header) {
                $this->raw .= "$i: $header\r\n";
        }
        
        $this->raw .= "\r\n{$http_request->body}";
        
        return $this->raw;
    }

}
